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Sintering behavior, microstructural evolution, and mechanical properties of ultra-fine grained alumina synthesized via in-situ spark plasma sintering
- Sintering behavior, microstructural evolution, and mechanical properties of ultra-fine grained alumina synthesized via in-situ spark plasma sintering
- Lee, KT[Lee, Kang Taek]; Cha, SI[Cha, Seung Ii]; Kim, KT[Kim, Kyung Tae]; Lee, KH[Lee, Kyung Ho]; Hong, SH[Hong, Soon Hyung]
- DGIST Authors
- Lee, KT[Lee, Kang Taek]
- Issue Date
- Ceramics International, 42(3), 4290-4297
- Article Type
- Abnormal Grain Growth; Alumina; Aluminum; Amorphous; Amorphous Materials; Fracture Toughness; Grain Growth; Grain Size and Shape; High Relative Densities; Micro-Structural Evolution; Micro-Structural Features; Powders; Sintered Alumina; Sintering; Sintering Behaviors; Sintering Condition; Situ Spark Plasma Sintering; Spark Plasma Sintering; Ultra-Fine-Grained; Ultra-Fine Grain Size
- Ultra-fine grained Al2O3 was fabricated by in-situ spark plasma sintering (SPS) process directly from amorphous powders. During in-situ sintering, phase transformation from amorphous to stable α-phase was completed by 1100 °C. High relative density over 99% of in-situ sintered Al2O3 was obtained in the sintering condition of 1400 °C under 65 MPa pressure without holding time. The grain size of in-situ sintered Al2O3 body was much finer (~400 nm) than that of Al2O3 sintered from the crystalline α-Al2O3 powders. For in-situ sintered Al2O3 from amorphous powders, we observed a characteristic microstructural feature of highly elongated grains in the ultra-fine grained matrix due to abnormal grain growth. Moreover, the properties of abnormally grown grains were controllable. Fracture toughness of in-situ sintered Al2O3 with the elongated grains was significantly enhanced due to the self-reinforcing effect via the crack deflection and bridging phenomena. © 2015 Elsevier Ltd and Techna Group S.r.l.
- Elsevier Ltd
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- Department of Energy Science and EngineeringAECSL(Advanced Energy Conversion and Storage Lab)1. Journal Articles
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